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However, all the other pages on this list that I checked are still in the index.
Could this be the cause of it disappearing or could it be something else?
Will submitting a Sitemap help it reappear quicker?
I think I can see what has happened. I have another thumbnail page, down a level, which is almost identical (only to robots) to the page that disappeared. The page not being available for spidering may have triggered Google to display this one in the index instead. Trouble is, it doesn't rank as good as there are no backlinks to it. Could a 301 redirect here bring this page back in a timely fashion?